TORTOISE License Yes NITRC TORTOISE Yes Lin-Ching Chang The TORTOISE software package is for processing diffusion MRI data. It contains two main modules, DIFF_PREP and DIFF_CALC. DIFF_PREP - software for image resampling, motion, eddy current distortion and susceptibility induced EPI distortion corrections, and for re-orientation of data to a common space DIFF_CALC - software for tensor fitting, error analysis, color map visualization and ROI analysis Software and sample data downloads, as well as documentation for the software, are available at http://www.tortoisedti.org. TORTOISE Tensor Metric, MR, TORTOISE License, Amyotrophic Lateral Sclerosis, Parkinson Disease, Brain Injuries, Depression, Migraine Disorders http://www.nitrc.org/projects/tortoise/, http://www.tortoisedti.org changl@cua.edu